Lol, know that feeling well.
If you plan on breeding, then it's worth getting a seperate tank to grow the young on. Easier said than done though with all the rock in the tank!
Another good reason too for having a good look at what you can and can't mix as certain Malawi will interbreed and you may end up with some hybrids.
Find out what you can about where stock comes from, as I said, you want good quality fish.